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− If more than<br />
one casing<br />
string is used<br />
inside the<br />
surface casing,<br />
then more than<br />
one casing<br />
head may be<br />
needed.<br />
− An<br />
intermediate<br />
casing head<br />
may be added<br />
with each new<br />
casing string<br />
until the<br />
production<br />
casing has<br />
been hung.<br />
<strong>Well</strong> head
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